Costa has played a key role in propelling Atletico to new heights over the past two seasons and is a huge reason why the club is on the verge of winning their first domestic title since 1996 and their first-ever European championship.

When asked about the potential of leaving Vicente Calderon last month, Costa was unwilling to take his eye off the prize, per Marca.com, via ESPNFC's Miguel Delaney:

I feel good at Atletico, I am happy in Madrid. We will see what happens. There are offers, but it is too early yet to talk. Now I am just thinking about the end of the season, I want to win the Champions League and La Liga.

A strong finisher around the box, Costa has scored 56 goals in 94 appearances in all competitions over the past two seasons for Madrid. And only Real Madrid's Cristiano Ronaldo and Barcelona's Lionel Messi have scored more goals in La Liga this season.

For a squad like Chelsea, who thrive on the defensive end and sometimes struggle to generate offense, adding a prolific striker like Costa makes tons of sense.

Blues manager Jose Mourinho is well aware of the threat Costa presents on the counter-attack, and expressed the importance of adding a dynamic striker earlier this month, per Delaney:

Mourinho on Diego Costa signing: "Chelsea will be quite quiet in summer. We are going to do some critical signings. A striker? Yes."

While no Premier League club conceded fewer goals than Chelsea this past season, Manchester City and Liverpool each scored 30 more goals than the Blues.

By adding an explosive talent like Costa, Chelsea won't have to rely so heavily on up-and-coming midfielder Eden Hazard to score goals.

Chelsea supporters hoping to see more of what Costa brings to the table will have several opportunities to see him in action this summer, as he'll lead Atletico up against crosstown rivals Real Madrid in the UEFA Champions League final later this month and will then head to Brazil to represent Spain in the 2014 World Cup.